Related Clues:

• When doubled, confidential
• Soothe
• Shut up
• ''Quiet!''
• 'Be quiet!'
• 'Zip your lip!'
• When repeated, not to be repeated
• Mum's the word
• "Pipe down!"
• Stunned response
• Stillness
• Teacher's command
• "Quiet!"
• 'Quiet down!'
• 'Shut your mouth!'